Everything you are dong sounds great. Leaves are often free and easy to obtain this time of year (bagged up and ready to go.) You can let them compost, or just till them in as is and they will break down in place.
I like to run the mower over them after I blow them into piles, spread them over my beds, hose them down (they break down faster wet) and then top them with a layer of composted manure. I let them sit like that and then turn it all over in the Spring.
My soil is the opposite of yours - its all sand, so lots of organic material has been added over the years.
Good luck with it.